"""统计分析模块出入参（需求 2.6）。"""

from __future__ import annotations

from datetime import date
from typing import Any

from pydantic import BaseModel, Field


class ClassOverviewItem(BaseModel):
    """2.6.1 多维度班级统计：每班总人数 + 男女分布。"""

    class_id: int
    class_no: str
    class_name: str
    status_text: str | None = None
    head_teacher_name: str | None = None
    total: int = Field(0, description="总人数")
    male: int = Field(0, description="男生数")
    female: int = Field(0, description="女生数")
    other: int = Field(0, description="未标注性别人数")


class AllAboveItem(BaseModel):
    """2.6.2 每次考试都过线的学生。"""

    stu_id: int
    stu_no: str
    name: str
    class_name: str | None = None
    exam_count: int = Field(0, description="参加考核次数")
    min_score: float = Field(0, description="最低分（就是它决定了过线）")
    avg_score: float = Field(0, description="平均分")
    scores: list[dict[str, Any]] = Field(default_factory=list, description="各次成绩明细")


class FailDetailItem(BaseModel):
    """2.6.2 不及格明细。"""

    stu_id: int
    stu_no: str
    name: str
    class_name: str | None = None
    fail_times: int = Field(0, description="不及格次数")
    fail_details: list[dict[str, Any]] = Field(default_factory=list, description="不及格场次明细")


class ClassAvgScoreItem(BaseModel):
    """2.6.2 每场考试每个班级的平均分。"""

    exam_seq: int
    class_id: int | None = None
    class_name: str | None = None
    student_count: int = Field(0, description="参考人数")
    avg_score: float = Field(0, description="平均分")
    max_score: float = 0
    min_score: float = 0
    pass_rate: float = Field(0, description="及格率 %")


class SalaryTopItem(BaseModel):
    """2.6.3 就业薪资 Top N。"""

    rank: int
    stu_id: int
    stu_no: str
    name: str
    class_name: str | None = None
    company: str | None = None
    salary: float = 0
    salary_wan: float = 0
    offer_date: date | None = None
    duration_days: int | None = None


class StudentDurationItem(BaseModel):
    """2.6.3 每个学生的就业时长。"""

    stu_id: int
    stu_no: str
    name: str
    class_name: str | None = None
    company: str | None = None
    open_date: date | None = None
    offer_date: date | None = None
    duration_days: int | None = Field(None, description="offer 时间 - 开放时间（天）")
    state: str = Field("", description="就业中 / 已拿到 offer")


class ClassAvgDurationItem(BaseModel):
    """2.6.3 每个班级的平均就业时长。"""

    class_id: int | None = None
    class_name: str | None = None
    student_count: int = Field(0, description="班级总人数")
    open_count: int = Field(0, description="已开放就业的人数（统计基数）")
    offer_count: int = Field(0, description="已下发 offer 的人数")
    avg_duration_days: float | None = Field(None, description="平均就业时长（天）")
    min_duration_days: int | None = None
    max_duration_days: int | None = None


class VolatilityItem(BaseModel):
    """2.7.2 成绩波动分析。"""

    rank: int
    stu_id: int
    stu_no: str
    name: str
    class_name: str | None = None
    exam_count: int = 0
    avg_score: float = 0
    stddev: float = Field(0, description="成绩标准差")
    score_range: float = Field(0, description="最大分差 max-min")
    trend: str = Field("", description="上升 / 下降 / 基本持平（按最小二乘斜率，阈值 ±1 分/场）")
    trend_slope: float = Field(0, description="成绩趋势斜率，单位：分/场（对考核序次做最小二乘拟合）")
    scores: list[float] = Field(default_factory=list, description="按序次排列的成绩")


class FunnelItem(BaseModel):
    """2.7.2 班级就业漏斗。"""

    class_id: int
    class_no: str
    class_name: str
    total: int = Field(0, description="总人数")
    employed: int = Field(0, description="已就业人数（拿到 offer）")
    high_salary: int = Field(0, description="高薪人数（>= 高薪线）")
    employment_rate: float = Field(0, description="就业率 %")
    high_salary_rate: float = Field(0, description="高薪占已就业比例 %")
    avg_salary: float | None = Field(None, description="已就业学生平均薪资")
    avg_duration_days: float | None = Field(None, description="平均就业时长（天）")


class OverviewOut(BaseModel):
    """仪表盘概览。"""

    student_total: int = 0
    student_by_status: dict[str, int] = Field(default_factory=dict, description="各状态人数")
    class_total: int = 0
    teacher_total: int = 0
    advisor_total: int = 0
    employment_total: int = 0
    employment_rate: float = Field(0, description="整体就业率 %")
    avg_salary: float | None = None
    high_salary_count: int = 0
    score_record_total: int = 0
    score_avg: float | None = None
    warning_student_count: int = Field(0, description="存在红线预警的学生数")
    top_classes: list[dict[str, Any]] = Field(default_factory=list, description="就业率前 5 班级")